Willis, 59, and the model's new addition joined big sister Mabel, 24 months, earlier this month. She weighed in at 8lbs, 10oz., and was said to be doing healthy and "doing beautifully" at the time. Days after the birth, Heming-Willis shared a snapshot of Willis and their eldest on her official page. "Feeling lucky, loved, and blessed. Sleep tight everyone xx," she wrote.